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| Number | Title | Issue Date |
| 7329628 | Method for preparing catalysts for partial oxidation of propylene and iso-butylene The present invention relates to a process for preparing a catalyst for partial oxidation of propylene and iso-butylene, and more particularly to a process for preparing a catalyst for partial oxidation of propylene and iso-butylene that can stably prepare a catalys... | 02/12/2008 |
| 6946422 | Preparation of mixed metal oxide catalysts for catalytic oxidation of olefins to unsaturated aldehydes A process for making a catalyst containing oxides of molybdenum, bismuth, iron, cesium and, optionally, other metals, such as tungsten, cobalt, nickel, antimony, magnesium, zinc, phosphorus, potassium, rubidium, thallium, manganese, barium, chromium, boron, sulfur, ... | 09/20/2005 |
| 6921830 | Method for purifying an organic solvent for the purposes of absorption of maleic acid anhydride In a process for purifying an organic solvent for the absorption of maleic anhydride from a gaseous mixture, in which the maleic anhydride is separated off from the solvent, a substream is taken from the solvent stream, this substream is distilled and returned to th... | 07/26/2005 |
| 6916763 | Process for preparing a catalyst for the oxidation and ammoxidation of olefins A process for preparing an antimonate-based mixed metal oxide catalyst in a catalytically active oxidized state, wherein the catalyst is represented by the empirical formula MeaSbbXcQdReOf, wherein Me... | 07/12/2005 |
| 6905576 | Method and system for producing silane This invention relates to a continuous process for the preparation of silane by catalytic disproportionation of trichlorosilane in a reactive/distillative reaction zone having a catalyst bed of catalytically active solid. ... | 06/14/2005 |
| 6841686 | Molybdenum based oxidation catalysts This invention concerns catalysts comprising a molybdenum compound of formula I, II, III, IV or V VqMoAyOz I NiMoxByOz′ II VNiwMoxC... | 01/11/2005 |
| 6624315 | Method of gas phase catalytic oxidation to give maleic acid anhydride A process for the preparation of maleic anhydride by heterogeneously catalyzed gas-phase oxidation in a reactor with feed for the reaction mixture at one end of the reactor and discharge of the product mixture at the opposite end of the reactor, and with ... | 09/23/2003 |
| 6593495 | Anhydride stabilization Disclosed herein are compositions comprising organic anhydrides having a reduced tendency to discolor with time, even when held at elevated temperatures for extended times. The compositions are produced by mixing at least one acid halide and various deriv... | 07/15/2003 |
| 6458971 | Process for the production of maleic anhydride Disclosed is a process for the preparation of maleic anhydride which comprises subjecting an aliphatic hydrocarbon having four or more carbon atoms to gas phase oxidation reaction in the presence of a catalyst, wherein supposing that the function of react... | 10/01/2002 |
| 6413903 | High surface area sol-gel route prepared oxidation catalysts This invention relates to catalysts useful in the vapor phase oxidation of hydrocarbons, such as 1,3-butadiene to furan and maleic anhydride. The catalysts comprise vanadium oxides, vanadium phosphorus oxides or vanadium antimony oxides incorporated in a ... | 07/02/2002 |
| 6310219 | Process for the production of maleic anhydride Disclosed is a process for the production of maleic anhydride, which comprises: reacting a hydrocarbon with an oxygen-containing gas in the presence of a catalyst; recovering maleic anhydride from the reaction gas; recovering unreacted hydrocarbon from th... | 10/30/2001 |
| 6194587 | Production of maleic anhydride N-butane and molecular oxygen are reacted in a first reactor to form maleic anhydride, the produced maleic anhydride is scrubbed to separate maleic anhydride values, n-butane is added to the scrubber gases and these are reacted in a second reactor to form... | 02/27/2001 |
| 6093835 | Process for producing maleic anhydride A process for producing maleic anhydride is described, which comprises (i) reacting a hydrocarbon with oxygen in a vapor phase in the presence of a catalyst to yield a reaction mixture gas containing maleic anhydride, (ii) bringing the reaction mixture ga... | 07/25/2000 |
| 6020533 | Hydrocarbon conversion processes using crystalline manganese phosphate compositions Hydrocarbon conversion processes using a new family of crystalline manganese phosphate compositions is disclosed. These compositions have an extended network; which network can be a one-, two-, or three-dimensional network. The composition has an empirica... | 02/01/2000 |
| 6002019 | Process for the production of petrochemicals Petrochemicals are produced by the vapor phase reaction of a hydrocarbon with air in the presence of a suitable catalyst. The petrochemical product is removed from the product gas stream, and part or all of the remaining gas stream is passed through a bed... | 12/14/1999 |
| 5929255 | Process for coproducing fumaric acid and maleic anhydride The present invention provides a process for recovering fumaric acid formed as a by-product during the production of maleic anhydride so that both fumaric acid and maleic anhydride are obtained. The process of the present invention further eliminates the ... | 07/27/1999 |
| 5895817 | Method and apparatus for direct oxygen injection with a reactant stream into a fluidized bed reactor A system provides an oxygen-bearing gas and gaseous reactant stream to a fluidized bed reactor using a sparger to entrain the oxygen-bearing gas into the reactant gas stream. A feed line couples the sparger to the reactor's fluidized bed and introduces th... | 04/20/1999 |
| 5869700 | Method for recovering phthalic anhydride/maleic anhydride mixtures by distillation A process for recovering phthalic anhydride and maleic anhydride from a maleic anhydride-rich vapor phase oxidation product comprising the step of: contacting the vapor phase oxidation product with: (i) at least one by-product stream having a freezing poi... | 02/09/1999 |
| 5726327 | Process for the production of petrochemicals Petrochemicals are produced by the vapor phase reaction of a hydrocarbon with air in the presence of a suitable catalyst. The petrochemical product is removed from the product gas stream, and unreacted hydrocarbon in part or all of the remaining gas strea... | 03/10/1998 |
| 5646304 | Process for the production of petrochemicals A petrochemical is produced by the vapor phase reaction of a hydrocarbon with air in the presence of a suitable catalyst. The petrochemical is removed from the reactor effluent, and part or all of the remaining petrochemical-free gas stream is passed thro... | 07/08/1997 |
| 5631387 | Process for the preparation and recovery of maleic anhydride An improved process for the preparation and recovery of maleic anhydride in which the recovery of maleic anhydride from a gaseous reaction mixture includes absorbing the maleic anhydride in a solvent and subsequently stripping maleic anhydride from the so... | 05/20/1997 |
| 5532384 | Process for producing hydrocarbon partial oxidation products Hydrocarbon derivatives are produced by contacting a hydrocarbon with oxygen obtained from an air separation unit in the presence of a partial oxidation reaction catalyst. After separation of the hydrocarbon derivative from the reactor effluent, unreacted... | 07/02/1996 |
| 5473082 | Device for carrying out catalyzed reactions The catalytic process for producing maleic anhydride employs a catalytic device formed of pairs of vertically extending vapor permeable walls which define flow channels between the pairs of walls. In addition, each pair of walls defines an interspace whic... | 12/05/1995 |
| 5449792 | Method for the production of maleic anhydride A method for the production of maleic anhydride in which a hydrocarbon of 4 to 6 carbon atoms is subjected to a vapor phase catalytic oxidation reaction in the presence of a metal oxide catalyst, characterized in that the metal oxide catalyst includes a m... | 09/12/1995 |
| 5430181 | Process for improving a controlled oxidation reaction Process for improving a controlled oxidation reaction between at least one reactant and oxygen, in which at least one reactant is reacted with oxygen or an oxygen containing gas, constituting a reaction mixture, in the presence of at least one additional ... | 07/04/1995 |
| 5326886 | Maintaining VPO catalyst performance by aluminizing reactor internals in oxidation of butane to maleic anhydride Catalysts comprising a compound of vanadium, phosphorus and oxygen which are employed in the oxidation of n-butane to maleic anhydride are protected from contamination caused by side reactions which occur between the catalyst and steel process equipment b... | 07/05/1994 |
| 5262548 | Phosphorous/vanadium oxidation catalyst An improvement in the oxidation catalyst used for the partial oxidation of n-butane and containing vanadium and phosphorus, zinc and lithium mixed oxides which comprises adding a molybdenum compound modifier in an amount of from about 0.005 to 0.025/1 Mo/... | 11/16/1993 |
| 5245093 | Reaction processes in a multi-stage fluidized bed A process for reacting a fluid phase (gaseous and/or liquid phase) in contact with a solid phase in a reaction zone, wherein the improvement in said process comprises reacting the fluid phase in contact with the solid phase in a horizontally-oriented flui... | 09/14/1993 |
| 5235071 | Catalyst for producing phthalic anhydride and process by using the same The invention relates to a catalyst for producing phthalic anhydride by gas phase catalytic oxidation of o-xylene and/or naphthalene with molecular oxygen or gas containing molecular oxygen and, to a process for producing phthalic anhydride by using said ... | 08/10/1993 |
| 5185455 | Method for improving the performance of VPO catalysts An improvement in a process for the manufacture of maleic anhydride by catalytic oxidation of n-butane in the presence of trimethyl phosphate over a fixed bed vanadium phosphorus oxide catalyst in a tubular reactor. The trimethyl phosphate content of the ... | 02/09/1993 |
| 5179215 | Process for the production of petrochemicals An improved process is provided for the production of a petrochemical by the vapor phase reaction of a hydrocarbon with an oxygen-containing gas in the presence of a suitable catalyst to produce a flammable gaseous product stream comprising the desired pe... | 01/12/1993 |
| 5126463 | Process for the production of anhydrides This invention provides a process for the production of an anhydride by the vapor phase reaction of a hydrocarbon with substantially pure oxygen in the presence of a suitable catalyst. In the improved process, the anhydride product is removed, carbon mono... | 06/30/1992 |
| 5124291 | Method for deagglomerating and re-exposing catalyst in a fluid bed reactor A fluid bed catalyst which has lost activity or fluidization quality through agglomeration, contamination, or a physical or chemical change on the surface of the catalyst is deagglomerated and/or its surface re-exposed, by contacting the fluidized catalys... | 06/23/1992 |
| 5026876 | Process for producing maleic anhydride Crude maleic anhydride produced by catalytic oxidation is distilled and then n-propyl gallate, cuprous chloride and zinc chloride are added thereto. Alternatively, crude maleic anhydride is distilled in the presence of tridecyl phosphite. Further, these p... | 06/25/1991 |
| 4987239 | Process for the production of anhydrides An improved process is provided for the production of anhydrides from hydrocarbons by reaction with an oxygen-containing gas comprising oxygen, air or a gas enriched in oxygen relative to air, in the presence of a suitable catalyst. In the process, a sele... | 01/22/1991 |
| 4941895 | Process for the continuous separation of maleic anhydride from process gases A process is disclosed for increasing the recovery of maleic anhydride from the product condenser. Maleic anhydride is added to the oxidation reactor gaseous effluent. Maleic acid buildup in the condenser is reduced; condenser plugging is reduced; and pro... | 07/17/1990 |
| 4931572 | Aromatic carboxylic anhydride catalyst In accordance with the process of this invention, an improved titanium dioxide rutile-based catalyst for molecular oxidation of a hydrocarbon to form the corresponding carboxylic anhydrides is prepared by the steps of (a) forming a catalyst precursor by d... | 06/05/1990 |
| 4864036 | Process for preparing aromatic carboxylic anhydride In accordance with the process of this invention, an improved catalyst for molecular oxidation of a hydrocarbon to form the corresponding carboxylic anhydrides is prepared by the steps of (a) forming a catalyst precursor by depositing on titanium dioxide ... | 09/05/1989 |
| 4855457 | Carboxylic anhydride process In accordance with the process of this invention, an improved catalyst for molecular oxidation of a hydrocarbon to form the corresponding carboxylic anhydrides is prepared by the steps of (a) forming a catalyst precursor by depositing on titanium dioxide ... | 08/08/1989 |
| 4831164 | Process of preparing carboxylic anhydride In accordance with the process of this invention, an improved catalyst for molecular oxidation of hydrocarbons to form the corresponding carboxylic anhydrides is prepared by the steps of forming a catalyst precursor by depositing on titanium dioxide catal... | 05/16/1989 |
